Low-temperature selective catalytic reduction denitration catalyst and preparation method thereof

Abstract

The invention relates to a low-temperature selective catalytic reduction denitration catalyst and a preparation method of the catalyst. The denitration catalyst is composed of an active component, a catalysis promoter and a carrier, wherein a multiwalled carbon nanotube is used as the carrier, FeOx is used as the catalysis promoter, and MnOx is used as the active component. The preparation method comprises the steps that the carrier is subjected to nitric acid steam treatment, then, an incipient-wetness impregnation method is adopted for preparing the catalyst, the multiwalled carbon nanotube is modified through nitric acid steam, hydrophilia of the carbon nnaotube is improved, meanwhile, the specific area of the catalyst is increased, even dispersion of the active component on the surface of the carrier is promoted, the denitration activity of the catalyst is improved through interaction among MnOx, FeOx and the multiwalled carbon nanotube, ammonia is used as a reducing agent, and good catalysis activity is shown within the temperature range from 180 DEG C to 240 DEG C. The low-temperature selective catalytic reduction denitration catalyst have the advantages that operation saves time and is easy, the cost is saved, and environment is protected; by means of the catalyst, and an SCR denitration system can efficiently remove NOx in flue gas at low temperature.

Description

[technical field] [0001] The invention belongs to the field of environmental protection and environmental catalysis, in particular to a low-temperature selective catalytic reduction denitrification catalyst and a preparation method thereof. [Background technique] [0002] With the increasing development of the economy, my country's consumption of coal and the environmental pollution problems it brings are increasing day by day. The direct / indirect emissions of coal-fired exhaust, mainly nitrogen oxides (NOx), can not only cause environmental problems such as acid rain, photochemical smog, and ozone layer destruction, but also pose certain threats to human health. Therefore, the damage to the atmosphere caused by NOx emitted from coal combustion has become an environmental problem that cannot be ignored. Effectively controlling and reducing NOx emissions has become the focus of improving air pollution. [0003] At present, ammonia selective catalytic reduction technology (NH...

AI Technical Summary

Problems solved by technology

Traditional vanadium-based catalysts have insufficient low-temperature activity

The SCR method is the mainstream flue gas denitrification technology that has been successfully commercialized at present, and the denitrification catalyst is the core of this technology. Catalyst poisoning occurs due to the influence of SO2 and dust, followed by the high temperature (300-400°C) required for the catalyst to achieve the best activity, so the SCR device is often arranged before the dust removal and desulfurization device, so that the dust in the flue gas will Wear and block the catalyst bed, reducing the service life of the catalyst

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